Ferrocement PDF - Civil Engineering Materials

18/03/62 CVE236 Civil Engineering Materials Ferrocement Dr. Raktipong SAHAMITMONGKOL [email protected]...

18/03/62 CVE236 Civil Engineering Materials Ferrocement Dr. Raktipong SAHAMITMONGKOL [email protected] 1 Reinforced Concrete Image by: https://theconstructor.org Image by: www.pinterest.com Although reinforced concrete “RC” is a popular construction material. It has however some limitations. RC cannot be very thin. Normally 100-mm is minimum thickness of RC. Formwork is required for pouring concrete. Rebar cannot be tightly arranged. The spacing between rebar must be larger than maximum size of aggregate. 2 1 Coated by zynco Galvanized 18/03/62 Mortar o not have coarse aggregate Concreteo have both aggregate Ferrocement: Economical Alternative Components of Ferrocement Ferrocement Boat Manufacturing Image by: https://buildcivil.wordpress.com Image by: https://buildcivil.wordpress.com Ferrocement is an alternative which can be used in the case RC cannot suitably used. Ferrocement is a thin mortar reinforced with mesh. 3 Ferrocement: Definition ACI COMMITTEE 549: Ferrocement is a type of thin-wall reinforced concrete commonly constructed of hydraulic cement mortar reinforced with closely spaced layers of continuous and relatively small size wire mesh. The mesh may be made of metallic or other suitable materials. The fineness of the mortar matrix and its composition should be compatible with the mesh and armature systems it is meant to encapsulate. The matrix may contain discontinuous fibers. D -Test method 4 Standard > Specification standard. ~ Design 2  18/03/62 Ferrocement: Constituent Materials Cement Mortar Matrix Skeletal Steel Mesh Reinforcement 5 Ferrocement: Wire Mesh Reinforcement - Size & Cross Section - Geometry - Number of Layers (usually 2 - 10 layers) Pictures by a courtesy of Dr.Pichai Nimityongskul 6 3  18/03/62 Ferrocement: Production Process Step 1: Preparing the skeletal steel Step 2: Tying the wire mesh Step 3: Plastering Ferrocement: Production Process Step 4: Finishing Ferrocement Bowl Prototype 4  18/03/62 Properties of Ferrocement Flexural Behavior & Flexural Cracks H.F. Muhlert (1970) Ferrocement: Advantages Has high toughness and ductility. Has high impact resistance. Has good crack controlling ability. Can be formed into any desired shape. Does not required the formwork. Is relatively cheaper (especially in countries with low labor cost) 5  18/03/62 Ferrocement: Cautions Risk of corrosion (because of relatively thin cover) Quality control & Workmanship When applied for repair or strengthening, good bonding with substrate should be confirmed Strengthening by Ferrocement Installation of the Framework and Marking Positions before Tying Perforation at Marking Positions Tied the Skeletal Steels Position of the Ties (8 Positions) with the Reinforcements 6  18/03/62 Strengthening by Ferrocement Plastering by Using Mortar Plaster Strengthening of the Specimens Comparison and Before by Single Form Layer and After Strengthening END 7